Phosphorus speciation, burial and regeneration in coastal lagoon sediments of the Gippsland Lakes (Victoria, Australia)

Phil Monbet; Ian D. McKelvie; Paul. J. Worsfold

doi:10.1071/EN07049

RESEARCH ARTICLE

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Phosphorus speciation, burial and regeneration in coastal lagoon sediments of the Gippsland Lakes (Victoria, Australia)

Phil Monbet ^A ^B ^C , Ian D. McKelvie ^B and Paul. J. Worsfold ^A

+ Author Affiliations

- Author Affiliations

^A Biogeochemistry & Environmental Analytical Chemistry Group, School of Earth, Ocean and Environmental Sciences, University of Plymouth, Plymouth PL4 8AA, Devon, United Kingdom.

^B Water Studies Centre, School of Chemistry, Monash University, Clayton, Vic. 3800, Australia.

^C Corresponding author. Email: mombz31@yahoo.fr

Environmental Chemistry 4(5) 334-346 https://doi.org/10.1071/EN07049
Submitted: 16 July 2007 Accepted: 25 September 2007 Published: 2 November 2007

Environmental context. Eutrophication can lead to the production of harmful algal blooms and is one of the world’s most serious water quality issues. Phosphorus is potentially the limiting macro-nutrient in fresh, estuarine and some marine waters. Consequently, it plays a crucial role in determining the ecological status of many aquatic ecosystems. Considerable effort has been invested in monitoring dissolved reactive phosphorus and total phosphorus in the water column, but less is known about the speciation of phosphorus, particularly in the sediment. This compartment is an important and dynamic reservoir of phosphorus and a potential long-term source of phosphorus release to the water column by the sediment–water interface. This paper investigates the solid-phase speciation and reorganisation of phosphorus within the sediments of a shallow lake system in south-east Australia (the Gippsland Lakes) which suffers from recurring harmful algae blooms. Various strategies are proposed to determine the minimum realistic timescale required to deplete the sediment of labile and reactive phosphorus species.

Abstract. Solid-phase phosphorus pools in the sediments of two shallow lakes (Wellington and Victoria) in the Gippsland Lakes coastal lagoon system of south-east Australia are discussed. Cores (20-cm depth) were taken in summer and winter in both lakes and a sequential extraction scheme (SEDEX) was used to profile the exchangeable P (P_ex), iron oxide/hydroxide bound P (P_Fe), authigenic P (P_auth), detrital P (P_det) and organic P (P_org). Pore-water (P_pw) dissolved reactive phosphorus concentration profiles were also measured. The dominant forms of P were P_Fe (up to 53%) and P_org (35–55%), with the P_Fe fraction playing a key role in the short-term retention of P in the sediment. Benthic phosphorus fluxes at the sediment–water interface (μmol m^–2 d^–1) were determined from the sequential extraction data. The results were compared with flux measurements from the complementary approaches of benthic chamber experiments and Fickian diffusion calculations, to allow an insight into the nature and seasonal variations of the fluxes. The burial flux of phosphorus was also estimated from excess ²¹⁰Pb profiles in the sediment of the lakes. All of these data were used to produce a phosphorus budget for the Gippsland Lakes which suggested that the sediment represents a substantial source of phosphorus within the lakes and thus clearly highlights the importance of the sedimentary compartment in shallow eutrophic ecosystems. Minimum realistic timescales for complete labile phosphorus depletion from the sediment (assuming no resupply from the sediment–water interface) were calculated and ranged from 8 to 22 years.

Additional keywords: depletion time, phosphorus forms, shallow lakes.

Acknowledgements

This research project ‘P-DIAGENEX’ has been supported by a Marie Curie Outgoing International Fellowship of the European Community programme ‘Structuring the European Research Area’ under contract MOIF-CT-2005-008073 for Ph. Monbet. The authors are grateful to S. Roberts for his kind help with the collection of samples. The authors also thank I. Zagorskis for providing maps.

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Phosphorus speciation, burial and regeneration in coastal lagoon sediments of the Gippsland Lakes (Victoria, Australia)

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